相位差法波前传感系统自身误差的分析及消除方法
Analysis and elimination of errors in phase diversity wavefront sensing system
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摘要: 针对附加像差为离焦的情况，对焦面位置误差、离焦量误差、图像对准误差以及图像噪声等因素带来的波前传感误差进行了数值模拟，并给出了确定焦面位置、对准焦面图像和离焦面图像、精确计算分光比、确定离焦量以及处理图像噪声的方法。使得传感结果的均方根误差分别由0.088 8λ,0.059 0λ,0.128 4λ,4.170 6λ,0.152 6λ降为0.002 1λ,0.002 1λ,0.002 1λ,0.002 1λ,0.029 2λ。结果表明:这些方法可以有效地减小传感误差，大大提高了传感精度，为相位差法的实际应用提供了重要的技术支持。Abstract: Phase diversity wavefront sensing (PDWFS), which has a simple configuration and a low cost, can be used to estimate wavefront for point source as well as extended source. However, there are various errors in its image collection and phase retrieval procedure. A numerical simulation of wavefront sensing errors caused by many factors is carried out in the case that the diversity function is defocus. These factors include the optical aberrations, focal plane position error, uncertainty of the defocus, image misalignment, image noise and so on. Approaches of eliminating or reducing these errors are given. The results show that these methods could reduce the errors effectively, and could improve the sensing accuracy greatly, which provide an important technical support for the practical applica
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